Aggregation of organic matter by pelagic tunicates
Journal Article
·
· Limnol. Oceanogr.; (United States)
- Univ. of Georgia, Athens
Three genera of pelagic tunicates were fed concentrates of natural seston and an axenic diatom culture. Fresh and up to 4-day-old feces resemble flocculent organic aggregates containing populations of microorganisms, as described from highly productive parts of the ocean, and older feces resemble the nearly sterile flocculent aggregates which are ubiquitous in surface waters. Fresh feces consist of partially digested phytoplankton and other inclusions in an amorphous gelatinous matrix. After 18 to 36 h, a population of large bacteria develops in the matrix and in some of the remains of phytoplankton contained in the feces. From 48 to 96 h, protozoan populations arise which consume the bacteria and sometimes the remains of the phytoplankton in the feces. Thereafter only a sparse population of microorganisms remains, and the particles begin to fragment. Water samples taken in or below dense populations of salps and doliolids contained greater numbers of flocculent aggregates than did samples from adjacent stations.
- DOE Contract Number:
- AS09-76EV00639
- OSTI ID:
- 6644939
- Journal Information:
- Limnol. Oceanogr.; (United States), Journal Name: Limnol. Oceanogr.; (United States) Vol. 25:4; ISSN LIOCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
520100* -- Environment
Aquatic-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
550500 -- Metabolism
550700 -- Microbiology
59 BASIC BIOLOGICAL SCIENCES
AGGLOMERATION
AQUATIC ECOSYSTEMS
AQUATIC ORGANISMS
BACTERIA
BIOCONVERSION
BIOLOGICAL ACCUMULATION
BIOLOGICAL MATERIALS
BIOLOGICAL WASTES
ECOSYSTEMS
ENVIRONMENTAL EXPOSURE PATHWAY
FECES
FOOD
FOOD CHAINS
HYDROGEN COMPOUNDS
MATERIALS
METABOLISM
MICROORGANISMS
OCEANOGRAPHY
ORGANIC WASTES
OXYGEN COMPOUNDS
PHYTOPLANKTON
PLANKTON
POPULATIONS
SEAWATER
WASTES
WATER
ZOOPLANKTON
Aquatic-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
550500 -- Metabolism
550700 -- Microbiology
59 BASIC BIOLOGICAL SCIENCES
AGGLOMERATION
AQUATIC ECOSYSTEMS
AQUATIC ORGANISMS
BACTERIA
BIOCONVERSION
BIOLOGICAL ACCUMULATION
BIOLOGICAL MATERIALS
BIOLOGICAL WASTES
ECOSYSTEMS
ENVIRONMENTAL EXPOSURE PATHWAY
FECES
FOOD
FOOD CHAINS
HYDROGEN COMPOUNDS
MATERIALS
METABOLISM
MICROORGANISMS
OCEANOGRAPHY
ORGANIC WASTES
OXYGEN COMPOUNDS
PHYTOPLANKTON
PLANKTON
POPULATIONS
SEAWATER
WASTES
WATER
ZOOPLANKTON